[webcryto] Validate key usages during key creation.

content/child/webcrypto/platform_crypto_nss.cc

Index: content/child/webcrypto/platform_crypto_nss.cc
diff --git a/content/child/webcrypto/platform_crypto_nss.cc b/content/child/webcrypto/platform_crypto_nss.cc
index 91a066f0e46a2fb93288d5473be01224a1558d71..3d0e9923a69f4185b2bdb2e4919fa2ff61e25204 100644
--- a/content/child/webcrypto/platform_crypto_nss.cc
+++ b/content/child/webcrypto/platform_crypto_nss.cc
@@ -1440,7 +1440,8 @@ Status EncryptDecryptAesGcm(EncryptOrDecrypt mode,
 
 Status GenerateRsaKeyPair(const blink::WebCryptoAlgorithm& algorithm,
                           bool extractable,
-                          blink::WebCryptoKeyUsageMask usage_mask,
+                          blink::WebCryptoKeyUsageMask public_key_usage_mask,
+                          blink::WebCryptoKeyUsageMask private_key_usage_mask,
                           unsigned int modulus_length_bits,
                           const CryptoData& public_exponent,
                           blink::WebCryptoKey* public_key,
@@ -1523,12 +1524,12 @@ Status GenerateRsaKeyPair(const blink::WebCryptoAlgorithm& algorithm,
                                             blink::WebCryptoKeyTypePublic,
                                             true,
                                             key_algorithm,
-                                            usage_mask);
+                                            public_key_usage_mask);
   *private_key = blink::WebCryptoKey::create(private_key_handle.release(),
                                              blink::WebCryptoKeyTypePrivate,
                                              extractable,
                                              key_algorithm,
-                                             usage_mask);
+                                             private_key_usage_mask);
 
   return Status::Success();
 }